Electric regulation.



JOHN L. CREVELING, OF NEW YORK, N. Y.

PATENT OFFICE.

LIGHTING COMPANY, A CORPORATION OF NEW JERSEY.

ELECTRIC REGULATION.

Application filed December 29, 1910, Serial No. 599,873.

To all whom it may concern Be it known that I, JOHN L. CREVELING, a residentof the city, county, and State of New York, have invented certain new and useful Improvements in Electric Regulation, as set forth in the annexed specification and drawing, forming a part thereof.

My invention. pertains to that class of electric regulation wherein it is desired to automatically regulate a dynamo or generator in a predetermined manner.

My invention has for its particular object to provide means whereby a dynamo or generator may be automatically governed or'controlled in such manner as to properly charge a storage battery and operate lamps or translating devices.

Figure 1 is a diagrammatical representation of one type of system embodying the essentials of my invention.

Fig. 2 is a modified form of system embodying my invention.

In the drawing, Figs. 1 and 2, 1 represents a dynamo or generator, provided with the usual field coil 2, having in circuit therewith a regulating means 3 in this particular instance indicated as a variable resistance 8 represents a bell crank lever normally drawn in an upward direction as by adjustable spring 9 in such manner as to tend to compact the carbon pile 3 and reduce' the resistance thereof. 10 is a core of magnetic material carried by the lever 8 in such manher that pull on the core in a downward direction tends to lessen the pressure upon the carbon pile 3 and decrease the voltage of the generator. 11 is a coil in shunt across the generator circuit as by means of wires 12 and 13 so arranged as to tend, when energized, to'pull the core 10 downwardly against the action of spring 9 and increase the resistance 3.

In Fig. 1, the lead 4 is shown as havingin series therewith coil 14 surrounding the core of magnetic-material 15 in such manher that when energized, said coil tends Specification of Letters Patent.

Patented Feb. 4, 1919.

Renewed June 22, 1918. Serial No. 241,437.

to lift the core 15. 16 is a bell crank lever carrying the core 15 and normally drawn in a downward direction against the adjustable stop 17 as by the adjustable spring 18. 19 is a variable resistance in this instance indicated as of the carbon disk variety, so arranged that movement of the core 15 in an upward direction tends to compress the pile 19 and lower the resistance thereof. 20 is a coil surrounding the core 10, having one of its ends connected with the lead 7 as by wire 21 and the other end with one side of the resistance 19 as by wire 22. The opposite side of the resistance 19 is connected with the generator circuit as by means of wire 23 shown in communication with the wire 12. The coils 11 and 20 are so wound that their magneto-motiveforces are in a uniform direction and therefore they assist each other when energized.

In Fig. 2, the battery 5 is shown connect- 'ed across the leads 4 and 7 through a series coil 24, surrounding the core 25 of iron or other magnetic material in such manner that when energized, the said coil tends to lift the core 25 carried by the bell crank lever 26 against the action of adjustable spring 27 which normally tends to draw the lever 26 downwardly in such manner as to compress the carbon pile 28 and reduce the resistance thereof. 29 is a winding surrounding the core 10 having one of its ends connected with the lead 7 as by wire 30, the opposite end of said coil being connected as by wire .31 with one side of the carbon pile 28, the opposite side of which is connected as by wire 32 with the lead 4 through wire 12. The coils 1 1 and 29 are wound in such directions that the magnetomotive-forces of said coils oppose each other when energized.

The practical operation of my invention in a system as indicated in Fig.1, is sub-- stantially as follows: Starting with the generator running and the battery charged until near its maximum desired voltage, currentv will flow from the generator through the field winding 2 and resistance 3 in a well known manner and the voltage of the generator may be readily governed by the pressure upon the pile 3.

Current will flow through the lead 4, and coil 14 to the battery 5 and translating de vices 6 and return to thegenerator through lead 7 Current will also flow from the ASSIGN OR TO SAFETY CAR HEATING AND lead 4 through wire 12, coil 11 and wire 13 to the lead 7 and current will tend to flow through wire 12, wire 23, resistance 19, wire 22, coil and wire 21 to the lead 7 and, if the battery 5 be at or near the desired maximum voltage desired upon the line, the current flowing therethrough will be small and the pull exerted by the coil ll will be small and I so adjust the spring 18 as to 8 depressed in such manner as to increase the resistance 3 and hold the generator voltage constant at this maximum amount. If the generator voltage decrease, the pressure upon the pile 8 will be increased by the spring 9 and thus the generator will tend to hold the maximum voltage for which the regula tor is set, upon the line.

If now, We consider the voltage of the battery to have fallen quite below the normal so that the normal voltage for which the generator regulator is. set will force too great a current through the battery 5 or if We load the translation circuit so as to brin its resistance sufficiently low, so that the volt age for which the regulator has been set as above, will cause the generator to deliver too great a current, then under either of these above set forth conditions as may be chosen, I so adjust the spring 18 that when the maximum desired current is being delivered by the generator through the coil 14 any further increase in current will cause the core 15 to be raised and the resistance of the pile 19 lowered in such manner as to increase the current flowing from the coil 20 and thus assist the coil 11 in increasing the resistance 8 and lowering the voltage of the generator in such manner as to hold the voltage upon the line insufficient to cause the current delivered by the generator to exceed this desired maximum amount.

If now a part of the load be thrown off of the translation circuit or the battery voltage rise due to charging, the current in the uallyallow the spring 18 to increase the resistance 19 to a maximum at which time the normal voltage will be held across the generator by the coil 11 and the system will be under these conditions, a plain voltage controlled system and the charge to the battery Wlll taper off as its voltage rises.

In the system shown in Fig. 2, starting for example with the batteries charged until their voltage is in the neighborhood of the maximum desired to have impressed upon the line, under which condition, there will be very little current in the coil 24:, I so adjust the spring 27 as to compact the carbons 28 and thus cause the current in the coil 29 to be a maximum. This coil is opposed to the coil 11, which is the principal coil of the generator regulator and I now so adjust the spring 9 that with this maximum voltage desired across the generator, the excess in pull of the coil 11 over the coil 29 will, if the normal be exceeded cause the lever 8 to be depressed and the resistance 3 increased and thus prevent the generator from rising appreciable in voltage above this desired amount.

If now, we consider the battery to have been discharged until its voltage is quite below the normal desired maximum voltage across the generator, this voltage would cause too great a current to be delivered to the battery, and I so adjust the spring 27 that when the maximum desired current is delivered to the battery, any excess above this current will cause the core 25 to be raised and the resistance 28 increased in such manner as to weaken the coil 29 and thus weaken the opposition to coil 11 which will allow coil 11 to depress the lever 8 and increase the resistance 3 in such manner as to decrease the generator voltage and hold a voltage upon the line insufiicient to cause too great a current being delivered to the battery.

It will be obvious that in both of the systems described as illustrating my invention, the generator is automatically regulated to 100 hold constant potential across the external circuit and it will be plain that, when condi tions are such as to cause this voltage to deliver too great a current through the battery, the current-actuated modifying means comes 105 into play and affects the generator regulator in such a way that the current cannot be increased; that is, my invention is at all times a system which operates in such a manner that the maximum voltage to be maintained 110 across the line is determined by the current delivered to some portion of the system.

I do not wish in any way to limit myself to the exact details of construction and operation above set forth as a mere diagram- 115 matic representation of one form of employment of my invention, as wide departure coil 14: w1ll lessen and the same will gradfecting said varying means, said affecting means being in shunt with said varying means, and means for automatically controlling said aflecting means.

2. The combination of a generator and a regulator the efor, means for Varying the effect of the regulator, means for afiecting said varying means, said afiecting means being in circmt With said generator, and means actuated by current delivered by said generator for controlling the aflecting means.

8. The combination of a generator and a regulator therefor, voltage responsive means for varying the effect of the regulator, means in shunt With said varying means for affecting the same, and means for automatically controlling the afiecting means.

4:. The combination of a generator and a regulator therefor, voltage responsive means for varying the effect of the regulator, means for affecting the varying means, and means actuated by current delivered by the generator to control the affecting means.

5. The combination of a generator and a regulator therefor, voltage responsive means for varying the effect of the regulator, means in shunt With the first means for afiecting the varying means, and means actuated by current delivered by the generator to control the alfecting means.

6. The combination of a generator, a regulator therefor, a voltage responsive coil for varying the efiect of the regulator, a second voltage responsive coil in shunt With the first coil to vary the effect of the first named coil, a regulator for said second named coil, and a coil actuated by current delivered by the generator for controlling said last named regulator.

JOHN L. .CREVELING.

Witnesses:

CHAS. MoC. CHAPMAN, ANITA E. TRUES.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Wsshlngton, D. 0." 

